1. Symantec/
  2. Security Response/
  3. VBS.Confi


October 23, 2003
February 13, 2007 12:12:48 PM
Also Known As:
Systems Affected:

VBS.Confi is a Visual Basic Script (VBScript) virus that spreads through floppy disks. When it is executed, it launches a "windowbomb" by repeatedly opening Web browser windows. The 11th time that this virus is executed, it replaces the "Winstart.bat" file with commands to delete all the files on the A, C, D, and E drives.

This virus consists of a VBScript embedded in a .htt (hypertext template) file. Windows normally uses the .htt files to control how folders are displayed in Windows Explorer. VBS.Confi uses this mechanism to ensure that the virus is executed every time a folder is opened. It is possible to infect a computer with VBS.Confi, by viewing the contents of an infected floppy disk with Windows Explorer.

The presence of the file MSkernel32.con or MSkernel.con is a sign of possible infection.

Virus definitions dated prior to October 24, 2003 may detect this threat as JS.Exception.Exploit.

Antivirus Protection Dates

  • Initial Rapid Release version October 24, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version October 24, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date October 29, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Heather Shannon

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